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Templates are loaded first by searching the application and then by searching the classpath. If a template needs to be overridden, an edited copy can be placed in the application, so that is found first.
Templates are loaded based the template directory and theme name (see Selecting Themes). The template directory is defined by the
struts.ui.templateDir property in struts.properties (defaults to
template). If a tag is using the
xhtml theme, the following two locations will be searched (in this order):
In the application
In the classpath
For performance reasons, you may want to prefer the first location, although the second one is more flexible. See Performance Tuning for a discussion on this topic.
The default templates provided in the
struts-core.jar should suit the needs of many applications. However, if a template needs to be modified, it's easy to plug in a new version. Extract the template you need to change from the
struts-core.jar, make the modifications, and save the updated copy to
/template/$theme/$template.ftl. If you are using the xhmtl theme and need to change how the select tags render, edit that template and save it to
It is easier and better to edit and override an existing template than provide a new one of your own.
It is possible to load template from other locations, like the file system or a URL. Loading templates from alternate locations can be useful not only for tags, but for custom results. For details, see the FreeMarker documentation and consult the section on extending the FreeMarkerManager.
The framework provides for template rendering engines other than FreeMarker. (Though, there is rarely a need to use another system!)
The framework supports three template engines, which can be controlled by the
struts.ui.templateSuffix in struts.properties.
FreeMarker-based template engine
Velocity-based template engine
JSP-based template engine
The only set of templates and themes provided in the distribution is for FreeMarker. In order to use another template engine, you must provide your own template and theme for that engine.